Process of CT Simulation:

The patient is placed in a treatment position using immobilization devices to ensure consistency throughout therapy. Use of the immobilization device is patient and treatment dependent. At Sound Cancer Care we use immobilization devices that include:

• “vac-lock bags” - small to large bags made of a durable, non-permeable shell which is filled with low-density polystyrene mini-spheres

• "treatment masks” - perforated plastic that is molded to the head, neck, or head and neck ensuring comfort with precision

• “bite blocks” - custom mouth guard reducing head and jaw movement

Considerations to patient comfort, dose to healthy tissue, and effective positioning for treatment are taken into account during the simulation. A detailed CT scan of the treatment area is performed, capturing cross-sectional images. Small skin markings or tattoos may be applied to help align the patient consistently for each treatment session.

The CT images are analyzed by radiation oncologists, dosimetrists, and physicists to design a customized radiation treatment plan, determining beam angles, dose distribution, and target volume.

Importance of CT Simulation in Radiation Therapy:

The CT simulation ensures precise tumor targeting while protecting healthy tissues. It helps customize treatment based on tumor size, shape, and location. It is often combined with previous CT, MRI, and PET imaging to plan radiation treatment. This imaging improves accuracy in advanced techniques like IMRT, IGRT, and SBRT as it will be a reference for daily treatment. An effective CT simulation is the best way to enhance treatment effectiveness while reducing side effects.